Starter Cranking issue

[shank]

I got 2 batteries that used to crank the motor over fine to start. Its odd both are now not working. Now they might crank it for half a second then just makes a whirling noise. 1 battery is lithium the other is agm. Lithium battery got Cca of 290.

Both batteries are fully charged via my powerpoint chargers.

If i pull spark plugs out they crank motor over fine. Obviously no compression this way.

If i pull stator cover off straight after trying to crank. Bendix is locked into flywheel gears and starter motor gear is lining up with bendix. Tesing bendix spring in and out is working fine.

I put a brand new starter motor in and having the same issue.

If i crank it via my car battery for a v8 motor it cranks motor over just fine.

I am going to get my batteries tested for cca rating tomorrow. But it seems odd 2 batteries would die at same time.

Any ideas on this situation ???

 

[shank]

Battery testing at 272 CCA so cant be that

 

[shank]

Thinking bendix but dunno how to test it yet. Gonna have to pull it out and have a look

 

[shank]

The starter motor sounds like it spinning and bendix in flywheel gear. Starter motor gear and the bendix gear locked in and no wear on teeth on these. But flywheel aint turning. So seems as though bendix is turning on starter gear but not transferring power to flyweel gear end of the bendix

 

[KMN]

Is your ring gear on your flywheel loose? It may seem tight by hand, but under load it could spin. That's what I'm thinking considering you're saying it will crank without plugs and the bendix will line up with the flywheel.

 

[Freakrider]

Battery and starter cables can seem fine but don't deliver enough amps sometimes I have found. You said a car battery spins it over fine maybe because it's compensating for the cables with real high cca's.

 

[shank]

Found the problem. Broken bendix. See the pics. Think its called a flyweight locator plate. Part of it broken off and it cracked through. Is causing bendix to not spin on its inner cog.

 

[iQRTurbo]

There is the piece and part number you need to fix it. Our high compression engines knock those apart all the time. They rarely crack to the center but one of the 3 ears fail regularly.